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Finding the Fourth Proportional to 1,385.36, 2,078.02 and 412.12

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Solution

The fourth proportional to 1,385.36, 2,078.02 and 412.12 is: 618.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.36 : 2,078.02 = 412.12 : x
  2. Step 2: Convert to fraction form
    1,385.36/2,078.02 = 412.12/x
  3. Step 3: Cross multiply
    1,385.36x = 2,078.02 × 412.12
  4. Step 4: Simplify right side
    1,385.36x = 856,393.60
  5. Step 5: Solve for x
    x = 856,393.60/1,385.36
  6. Step 6: Final answer
    x = 618.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.